Grass Valley iControl V.4.43 - Manual (Page 226)

Logs
Configuring Loudness Analysis Parameters
216
Figure 4-165
Configurable loudness analysis parameters
Parameter
name
Description Data set
Standard The program compliance loudness standard against which the loudness data will be
measured.
• G8 refers to the now-obsolete version of EBU-R128 recommending a gate value of -
8LU. The currently recommended value is -10LU.
• A85 1770-1 leaves the threshold level up to broadcasters and recommends an anchor
when available and a gate if necessary (used in USA, Canada).
• A85 1770-2 recommends a gate is ALWAYS enabled, having a threshold set to -10LU
(used in the European Union).
• ARIB TR-B32 is based on A85 1770-2 with a recommended threshold of -24LKFS
(absolute gate at -70LKFS, -10LU relative gate, 400ms sample blocks).
• EBU G8
• EBU G10
• ARIB TR-B32
• A85 1770-1
• A85 1770-2
Relative
Gating The concept of filtering out low volume sound by a configurable dB (LU) level below the
absolute loudness calculation in order to prevent skewing a loudness calculation with
very quiet sounds or silence. • -10dB
• -8dB
Short-Term
Window
1
1. Once loudness data is plotted in Analyzer, you should expect for the Short-Term Window plot series
not to begin until one cycle of its configured duration to have elapsed. This is due to there not being
enough data before this point with which to produce a moving average.
The intermediate length sliding time window. • 1s
• 2s
• 3s
• 4s
• 5s
• 6s
• 7s
• 8s
• 9s
• 10s
Note: Changes you make to any analysis parameters are immediately applied to a
new analysis.